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Warm ionized gas in the edge-on galaxies NGC 4565 and NGC 4631
Rand, Richard J.; Kulkarni, Shrinivas R.; Hester, J. J.
AA(Groningen, University, Netherlands), AB(California Institute of Technology, Pasadena), AC(Arizona State University, Tempe, AZ)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 1, Sept. 1, 1992, p. 97-103. Research supported by NSF, Packard Foundation, Infrared Processing and Analysis Center, and California Institute of Technology. (ApJ Homepage)
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NASA/STI Keywords:
Gas Temperature, H Alpha Line, Interstellar Matter, Ionized Gases, Spiral Galaxies, Halos, Milky Way Galaxy, Star Formation Rate, Vertical Distribution
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H-alpha observations of two edge-on galaxies - NGC 4565 and NGC 4631 - are reported. NGC 4565 is a weak H-alpha emitter, and shows no evidence for a chimney mode in its disk. It is most likely that its young associations do not contain the numbers of OB stars necessary to create superbubbles and chimneys and power a significant halo. NGC 4631 is a strong H-alpha emitter, and shows evidence of disturbances in its distribution of H-alpha emission, presumably due to recent encounters with its companions. The implications of these results on NGC 891, NGC 4565, and NGC 4631 for the disk-halo connection, in particular for the emerging connection between the galaxies' disk H-alpha emission and radio halo properties, are discussed. Above the nuclear region of NGC 4631, there is a clear vertical 'double-worm' structure, which is suggested to be due to the breakout of a large superbubble created by an encounter-driven star formation event in the central regions.

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